Django NameError：名称\'\'未定义

Question

我正在尝试创建一个按主题过滤博客帖子的视图，我在我的帖子表单中添加了一个名为“主题”的字段，并且，

我创建了一个视图： 我在 urls.py 中定义了路径：

我在终端中收到此错误：

    model = Post
    template_name = 'blog/political_posts.html' # <app>/<model>_<viewtype>.html
    context_object_name = 'posts'
    paginate_by = 5

    def get_queryset(self):
        user = get_object_or_404(User, username=self.kwargs.get('username'))
        return Post.objects.filter(topic=Political).order_by('date_posted') ```



```    path('politics/', PoliticalPostListView.as_view(), name='political-posts'), ```

I used a template from a working user_posts.html to test:

``` {% extends "blog/base.html" %}
{% block content %}
    <h1 class="md-3"> Posts by {{ view.kwargs.username }} ({{ page_obj.paginator.count }})</h1>
    {% for post in posts %}
        <article class="media content-section">
            <img class="rounded-circle article-img" src="{{post.author.profile.image.url }}">
            <div class="media-body">
            <div class="article-metadata">
                <a class="mr-2" href="{% url 'user-posts' post.author.username %}">{{ post.author }}</a>
                <small class="text-muted">{{ post.date_posted|date:"F d, Y" }}</small>
                <small class="text-muted">{{ post.topic }}</small>
            </div>
            <h2><a class="article-title" href="{% url 'post-detail' post.id %}">{{ post.title }}</a></h2>
            <p class="article-content">{{ post.content }}</p>
            </div>
        </article>
    {% endfor %} ```
 

File "/Users/leaghbranner/Desktop/django_project/blog/urls.py", line 21, in <module>
    path('politics/', PoliticalPostListView.as_view(), name='political-posts'),
NameError: name 'PoliticalPostListView' is not defined

And "This Site Cannot Be Reached." pagein my browser.

Any thoughts?

Answer 1

在你的urls.py。

如果像这样使用导入：

from . import views

# then use:
path('politics/', views.PoliticalPostListView.as_view(), name='political-posts'),

但如果使用：

from .views import PoliticalPostListView

# then use:
path('politics/', PoliticalPostListView.as_view(), name='political-posts'),